Geon-Tae Park, Myoung-Chan Kim, Min-Su Kim, Tae-Chong Noh, Ji-Hyun Ryu, Nam-Yung Park, Yang-Kook Sun
{"title":"Structural Unpredictability of a Cobalt-Free Layered Cathode and Its Mitigation for Producing Reliable, Sustainable Batteries","authors":"Geon-Tae Park, Myoung-Chan Kim, Min-Su Kim, Tae-Chong Noh, Ji-Hyun Ryu, Nam-Yung Park, Yang-Kook Sun","doi":"10.1002/aenm.202404593","DOIUrl":null,"url":null,"abstract":"To advance the sustainable development of Li-ion batteries, reducing the Co content in Li[Ni<i><sub>x</sub></i>Co<i><sub>y</sub></i>(Mn or Al)<sub>(1–</sub><i><sub>x</sub></i><sub>–</sub><i><sub>y</sub></i><sub>)</sub>]O<sub>2</sub> has become essential, prompting the exploration of Co-free Li[Ni<i><sub>x</sub></i>Mn<sub>(1–</sub><i><sub>x</sub></i><sub>)</sub>]O<sub>2</sub> alternatives. Among the promising solutions are Co-free layered cathodes with compositional concentration gradients, which offer significant potential. However, their unique microstructure and compositional partitioning, key to their performance, are highly sensitive to synthesis temperatures. Over-sintering can lead to the structural unpredictability of Co-free cathode materials and detrimental effects on electrochemical properties. In this study, a highly stable Co-free layered oxide cathode is developed by doping a concentration gradient Li[Ni<sub>0.9</sub>Mn<sub>0.1</sub>]O<sub>2</sub>, with high-valence ions. This innovative strategy significantly reduces sensitivity to calcination temperatures, minimizing nano- and microstructural changes across a broad temperature range (750–810 °C). The particle-level compositional gradation and grain-level heteroelement encapsulation contribute to the cathode material's exceptional electrochemical performance. Mo doping, in trace amounts, plays a pivotal role in maintaining the stability of Co-free cathodes, enabling the development of high-potential (4.3 V vs graphite) Co-free cathodes suitable for practical and sustainable Li-ion battery applications.","PeriodicalId":111,"journal":{"name":"Advanced Energy Materials","volume":"4 1","pages":""},"PeriodicalIF":24.4000,"publicationDate":"2024-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Advanced Energy Materials","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1002/aenm.202404593","RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 0
Abstract
To advance the sustainable development of Li-ion batteries, reducing the Co content in Li[NixCoy(Mn or Al)(1–x–y)]O2 has become essential, prompting the exploration of Co-free Li[NixMn(1–x)]O2 alternatives. Among the promising solutions are Co-free layered cathodes with compositional concentration gradients, which offer significant potential. However, their unique microstructure and compositional partitioning, key to their performance, are highly sensitive to synthesis temperatures. Over-sintering can lead to the structural unpredictability of Co-free cathode materials and detrimental effects on electrochemical properties. In this study, a highly stable Co-free layered oxide cathode is developed by doping a concentration gradient Li[Ni0.9Mn0.1]O2, with high-valence ions. This innovative strategy significantly reduces sensitivity to calcination temperatures, minimizing nano- and microstructural changes across a broad temperature range (750–810 °C). The particle-level compositional gradation and grain-level heteroelement encapsulation contribute to the cathode material's exceptional electrochemical performance. Mo doping, in trace amounts, plays a pivotal role in maintaining the stability of Co-free cathodes, enabling the development of high-potential (4.3 V vs graphite) Co-free cathodes suitable for practical and sustainable Li-ion battery applications.
期刊介绍:
Established in 2011, Advanced Energy Materials is an international, interdisciplinary, English-language journal that focuses on materials used in energy harvesting, conversion, and storage. It is regarded as a top-quality journal alongside Advanced Materials, Advanced Functional Materials, and Small.
With a 2022 Impact Factor of 27.8, Advanced Energy Materials is considered a prime source for the best energy-related research. The journal covers a wide range of topics in energy-related research, including organic and inorganic photovoltaics, batteries and supercapacitors, fuel cells, hydrogen generation and storage, thermoelectrics, water splitting and photocatalysis, solar fuels and thermosolar power, magnetocalorics, and piezoelectronics.
The readership of Advanced Energy Materials includes materials scientists, chemists, physicists, and engineers in both academia and industry. The journal is indexed in various databases and collections, such as Advanced Technologies & Aerospace Database, FIZ Karlsruhe, INSPEC (IET), Science Citation Index Expanded, Technology Collection, and Web of Science, among others.